Conical filter



FIG. 1 shows a perspective view of an embodiment of a conical filter, according to the principles of the present invention;

FIG. 2 shows a side elevational view thereof, the other sides being identical to that shown;

FIG. 3 shows a top plan view thereof; and,

FIG. 4 shows a bottom plan view thereof. 

The ornamental design for a conical filter, as shown and described. 